Shelf assembly



FIG. 1 is a front elevational view of a shelf assembly showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image of that shown;

FIG. 4 is a top, front, and left side perspective view of a second embodiment thereof;

FIG. 5 is a front elevational view of a third embodiment thereof;

FIG. 6 is a top plan view of the third embodiment thereof;

FIG. 7 is a top, front, and left side perspective view of fourth embodiment thereof;

FIG. 8 is a front elevational view of a fourth embodiment thereof;

FIG. 9 is a top plan view of the fourth embodiment thereof; and,

FIG. 10 is a top, front, and left side perspective view of a fifth embodiment thereof. 

The ornamental design for a shelf assembly, as shown and described. 